12. Two charges, one of charge +2.5 x 105 C and the other of charge 3.? x 107 C, are 25.0 cm apart. The positive charge is to the left ofthe negative charge. a. Draw a diagram showing the point charges and label a point '1' that is 20.0 cm to the left of the negative charge, on the line connecting the charges. (Field lines do not need to be drawn.) [K 2 marks] b. Calculate the electric field at point Y. [A 4 marks]